Brush holder for electric generators or motors



Dec. 11, 1928.

R. G LAFITE BRUSH HOLDER FOR ELECTRIC GENERATORS OR IOTORS Filed Dec. 15. 1926 1 N V EV TOR. Ruser E. L ah'IEL Patented Dec. 11, 1928.

UNITED STATES ROGER e. LAFITE, .OF KANSAS CITY, MISSOURI.

BRUSH HOLDER FOR ELECTRIC GENERATORS R MOTORS.

Application filed December 15, 1926.

This invention relates to novelly constructed brush holders for electric generators or motors and has for its primary object the provision of a simple, durable and effective I spring holding structure, which support a I brush holding spring in a way that will preclude its jumping out of place during the operation of the device.

Heretofore, the well known split post forming a part of the brush holding bracket and which is adapted to maintain the brush holding spring in place has been so made that it was not uncommon for the springs to become dislodged. i

Accordingly, this invention contemplates the provision of a spring holding post which is formed in such a manner that the brush holding spring will cooperate with certain of its parts in holding the brush holding spring in the proper operative position and positively against accidental displacement. In installing new brush holding springs in brackets wherein split posts were used, it was common practice for the mechanic to insert the spring and then attempt to pinch the parts of the post together by closing the slotover the upper edge of the spring. This practice in the majority of cases was destructive to the 0st in that the material forming the brac et would not stand the strain exerted.

Accordingly, it is extremely desirable to provide a spring holding post structure which incorporates novel means for holding the spring. One embodiment of the invention besides the preferred form, is shown in the accompanying drawing in which Figure 1 is a side elevation of a brush holding bracket showing the same attached to a generator;

Fig. 2 is a face view of the bracket entirely removed from the operative position and showing the use of spring holding posts formed in accordance with my invention;

Fig. 3 is an enlarged fragmentary side elevation of the spring holding post; i

Fig. 4 is a top view of the same; and

Fig. 5 is a modified form of the invention which performs the desired function.

Similar reference characters refer to like parts throughout the several views and the numeral 6 designates an ordinary generator which must be equipped with a brush holding bracket 7 having a plurality of springs 8 Serial No. 154.906.

which as is customary are each supported by its respective post 9 which is provided with a longitudinal slot 10 adapted to receive the inner end 12 of spring 8. It is from this slot 10 that the springs usually slide and the construction of each post 9 whenmade in accordance with this invention is such that the respective spring 8 will not be dislodged.

4; and urged to that position by normal force exerted on the spring when it is holding a brush in position. The direction of this force may be indicated by the arrows and before the spring 8 can be lifted from engagement with the slot 10 of the post, it is necessary to force the same from beneath shoulder 13. It is obvious that as soon as the spring 8 is inserted in the operative position, it will automatically shift to the position beneath the shoulder 13 where it cannot move out of slot 10.

The. modified form shown in Fig. 5 cmbodies the same invention as that form shown in the preferred embodiment, but the abutting shoulder 13 in this instance is formed in one side of slot 10. Care must be taken in practicing this invention to so limit the abutting shoulder that the spring will automatically fall thereunder and it is plain to be seen that if the shoulder were cut in the side of post 9 opposite to its location as shown in Fig. 4, the same would not function.

This accessory or replacement part for generators or motors may be made of metal or any other suitable material, as is now customary and the abutting shoulders formed on the posts during the die casting operation or cut therein after the same has been molded.

Having thus describedthe invention what is claimed as new and desired to secure by Letters Patent is:

1. In a device of the character described, a brush holding spring, a spring supporting post having a slot therein adapted to receive one end of said spring and an abutting shoulder adjacent said slot adapted to engage the spring; at a point Where said spring leaves said slot to curl about said Dost.

In, a brush ho der of the kind described brush holder L a sunporting post for said he no a longitudinal slot extending therein 1" n the outer end thereof for receiving; a portion of said spring, and a 1ongitudinai notch in said post adjacent said slot and having its outer portion spaced apart from the outer end of said slot. 10

In t'estinion whereof, I hereunto affix my signature.

ROGER Gr. LAFITE. 

